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Old 1st November 2013, 01:42 AM   #1
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Default Tube powered subwoofer

I have recently acquired a dead Pioneer subwoofer and had the great idea of building a tube powered subwoofer using the enclosure and speaker.
Does anybody have a schematic I could use?

Thanks
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Old 1st November 2013, 02:09 AM   #2
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The amp will need to be in it's own enclosure/chassis, not attached to the sub box. The vibration would be a killer.

jeff
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Old 1st November 2013, 02:12 AM   #3
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Talk to any of the custom "iron" builders. Optimizing an O/P transformer for high power and low frequencies only is not particularly difficult.

"Fixed" bias PPP KT88s in either a Williamson or Mullard style circuit will get the job done. Definitely SS rectify the B+. Antek's AS-4T360 should take care of all power requirements, except the small signal tube heaters. You could go DC there and knock the residual hum level for a loop.

Have you given any thought to crossover requirements?
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Old 1st November 2013, 12:40 PM   #4
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How much power are you looking for? I have a 6.6K 50W transformer that measured 750 Henries on the primary at 10V/20 Hz...
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Old 1st November 2013, 03:12 PM   #5
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Quote:
Originally Posted by vinylkid58 View Post
The amp will need to be in it's own enclosure/chassis, not attached to the sub box. The vibration would be a killer.

jeff
It is so logical....
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